Odpowiedź :
a) L = 4 cm + 200 mm + 40mm + 2dm = 4cm + 20 cm + 4 cm + 20 cm = 48cm
b) L = 300 mm + 30 cm + 4 dm = 30 cm + 30 cm + 40 cm = 100cm
c) L = 22 mm + 22 mm + 40mm + 4 cm + 2 cm = (22mm × 2) + (40 mm × 2) + 20 mm = 44 mm + 80 mm + 20 mm = 144 mm